I have inherit this  Settings-> Configuration -> Accounting. I have added one check box. when i mark this check box to true, after click on "apply" button, this check box showing like uncheked check box. But the value storing in database is "True".

I would get the field to that menu. But the value supplied to that field not showing properly. for example i have added a field "vattaxrateinvoice" and added value "10%" after click on "apply" button, the field vattaxrateinvoice not showing "10%". It is showing blank. But the value "10%" store in database perfectly